Q. Which of the following is the main difference between waveguide and transmission line?

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Q. Television signals are propagated as ground waves.

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Q. The characteristic impedance of loss less transmission line is

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Q. For a hollow waveguide, the axial current must necessarily be

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Q. Industrial heating furnaces such as arc and induction furnaces operate on __________ power factor

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Q. In order to receive a vertical polarized wave, the conductor of the dipole should be mounted

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Q. VSWR can have any value between

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Q. The input impedance for folded dipole antenna (two half dipole) is

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Q. Capacitance hats are installed on low frequency antenna is

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Q. Surface impedance at high frequencies is a consideration for

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Q. In a uniform plane wave E and H are related by

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Q. Antenna beamwidth is

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Q. The pure capacitor connected across an A.C. voltage consumed 20 W. This is due to

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Q. A dominant wave is characterised by which of the following?

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Q. The cut off wavelength λc for TE₂₀ mode for a standard rectangles waveguide is

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Q. F2 layer of atmosphere extends from

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Q. Whereas resonant antenna is bidirectional, non-resonant antenna is unidirectional.

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Q. In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

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Q. Which of the following antennas is λ /4 length?

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Q. The number of lobes on each side of a 31 resonant antenna will be

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